Access your Openmailbox.org Account from an Email Program using IMAP

Openmailbox.org provides IMAP access to your Openmailbox.org account, so you can connect to your email
from mobile devices and desktop email clients.

Openmailbox.org supports IMAP / SMTP

This means you don't have to use Openmailbox.org's webmail interface! You can
check your email and send messages using other email
programs (like Mailspring, Outlook Express, Apple Mail, or Mozilla Thunderbird).
Using desktop email applications can improve your workflow. They typically
offer more options, and your email is still available on your
computer when you're disconnected from the internet.